Summer sees the collaboration between utilitarian clothier Apolis and Californian brand Heritage Leather to produce the Mason Courier Bag, based upon the former’s classic 16″ silhouette. Drawing from Apolis’s utilitarian roots, the bag is composed of 13 oz. weatherproof and fire retardant natural cotton army duck material. The subtle earth tones and adjustable shoulder strap make the bag ideal for the summer as the Mason bag releases May 18, 2011 for $218 and is available for pre-order at Apolis.